Dear J. --
Besides spraying, you must internally treat your dogs. There is a solution that you get from the vet. You squeeze the tube of fluid onto the backbone area of your dogs and it will absorb into their skin. They sell this on the shelves in pet stores but it is not as effective as the vetinary one and is also much more irritating to the animal. Also put a flea and tick collar on them.
The critical thing is to have your yard sprayed. So probably what needs to be done is you will have to fog, get the dogs treated with flea baths -- soak them well -- treat them internally, put on flea collars -- and have your yard sprayed with the proper product all at the same time. This is not easy to do because every single corner of your home needs to be fogged. This means the inside of every cupboard and you will have to use spray in areas where the fog will not reach.
Since you are using poison, you will have to wash everything that you own. It is a big job. And yes you can call an exterminator, but I do not know what they charge these days or what the terms are. I only know that I have had this problem and the above is what is needed.
The season is coming, so I would suggest that you do this quickly and protect yourself as much as you can. A good fogger should last for 7 months and I would over-fog for the area. There is also a company that exists that has natural products that will help your dogs -- kills these pests on contact -- and you can use in the house without harm. If you are interested in finding out about these products, please feel free to contact me at ###-###-#### or 1-888-869-3236. My email address is ____@____.com Best to You
M.